What are Lumens, LED Lumens and Touch Lumens?
The lumen is the international unit for measuring the quantity of light relative to the sensitivity of your eyes per unit of time from a light source. The spectral content of the light is multiplied by the sensitivity curve of your eye to create a final result. Thus, a milliwatt of green light (555nm) counts much higher in lumens than a milliwatt of violet light (415nm) or a milliwatt of deep red light (675nm). The lumen does not address how the light may be concentrated by a reflector or lens, nor does it address how brightly a surface will be illuminated at some distance. The lumen simply measures the total amount of eye-sensitive light being emitted by the source. LEDs are tested after manufacture and sorted into bins. One of the bin categories has to do with how many lumens the LED will generate under a well defined set of conditions. For example, one manufacture places LEDs that generate from 87.4 lumens to 113.6 lumens at 350mA into their U bin and LEDs that generate from 113.6 l
